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A shortlist of the top three most useful, innovative and interesting social platforms today. Every day, new and exciting platforms emerge for distributing great ideas, products and answers, and the boundaries keep getting pushed further out each year

While working at Facebook in 2009, Adam D'Angelo and Charlie Cheever had a question: Why isn't there a place on the Internet where a question can be answered by someone who actually knows the answer? That question led the pair to start Quora , a Q&A website that allows users to share knowledge. You can pose a question, answer a question, and edit others' answers